Cam mechanism.



J. SELLIGMAN.

CAM MECHANISM.

APPLICATION FILEDMAR. 9. 1912.

1,166,089. Patented Dec. 28, 1915.

2 SHEETSSHEET I.

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J. SELLIGMAN.

CAM MECHANISM.

APPLICATION FILED MAR. a. 1912.

Patented Dec. 28,1915.

2 SHEETS-SHEET 2.

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COLUMBIA PLANDDRAPH 120.,WASHINGTON,Dv c.

lTFiD @TATFQS PATENT @FFlFOE,

JOSEPH SELLIGMAN, 0F LOUISVILLE, KENTUCKY.

CAM MECHANISM.

Application filed March 9, 1912.

To all 207mm 25 may concern.

Be it known that I, JOSEPH SELLIGMAN, a citizen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented new and useful Improvements in Cain Mechanisms, of which the following is a specification.

The present invention relates to a cam mechanism particularly adapted for use in connection with the key-board mechanism of all kinds of power driven typewriting machines, typesetting machines, linotype Inachines. punching machines, and related devices, as a resetting means for the latch mechanism used in connection with the said machinery, whereby when the complete movement of the type bars has been effected by means of the operation of the latch mechanism, the latter may be quickly and effectively returned to its normal position so as to be capable of operation immediately should it be desired to use again the particular key corresponding to the operated latch mechanism. The cam mechanism herein described, may, however, be used in connection with other kinds of machinery than those named, the cam and its operating means being novel, so far as I am aware, in

addition to the particular application thereof herein set forth.

A preferred example of constructional embodiment of the invention is illustrated in the accompanying drawings, but I wish at the outset to make it distinctly understood that the invention may be embodied in other forms, and I do not therefore, limit myself to the details herein described, excepting, of course, so far such limitations are specifically expressed in the appended claims.

In the drawings, in which like reference characters indicate like parts, throughout the several views, Figure 1 is a side elevation of the device, showing the parts in normal position in full lines, and a portion thereof in operative position in dotted lines; Fig. 2 is a top plan view, several reset-ting devices and. their corresponding key levers being shown arranged side by side, as in practice; Fig. 3 is a detail view of the resetting cam showing the same in position at the moment of its engagement with the latch mechanism; Fig. 4 is another view of the same snowing the cam extending from its axis and after it has restored the latch mechanism to its normal position; Fig. 5 is another detail view Specification of Letters Patent.

Patented Dec. 28, 1915. Serial No. 682,800.

of the resetting cam hereinafter referred to; Fig. 6 is a sectional view through several resetting cams arranged in juxtaposition on ashaft; Fig. 7 is an elevation of several resetting cams, each in its normal position, being mounted on the shaft at a quarter of a turn farther around than the preceding one; Fig. 8 is an elevation view of a modified form of latch mechanism hereinafter referred to; and Fig. 9 is an elevation view of an additional modified form of construction also hereinafter referred to.

Referring now particularly to the drawings, 1 indicates a suitable base for the device, which may be of any suitable form and on which are arranged two vertical standards 2 and 3 in which latter, near the upper ends thereof, a movable element which in the present instance is illustrated a longitudinally reciprocating element, as the latch bar 4, for example, has suitable bearings. It will be understood that when the device forming the present invention is used in connection with any power-driven keyboard mechanism, one latch mechanism and its corresponding resetting cam will be used in connection with each type bar and its corresponding key-lever, so that in Fig. 2 I have shown several latch bars 4 and their corresponding resetting cams, as well as the corresponding key-levers, arranged in juxtaposition. Arranged transversely of and above the latch-bar 4, is a spindle 5, around which are coiled a series of springs 6, one for each latch-bar, each spring being connected at 7 to its corresponding latch-bar. The purpose of the spring is to normally tend to impel the bar or latch-bar 4. in a direction toward the resetting cam, that is, toward the left (Fig. l). The spindle 5 may be revolved by means of the thumb-screw 8 so as to uniformly increase the tension of all the coiled springs arranged thereon. The spindle 5 has bearings in vertical standards 9, 9 and on the end of the spindle opposite that on which the thumb-screw is mounted, and close to the outside of one of the standards 9 supporting the spindle, is a ratchet wheel 10 with a pawl 11 so placed as to prevent the rotation of spindle 5 by the coiled springs 6. The tension of the coiled springs may be reduced by raising the pawl 11 out of contact with the ratchet wheel 10 and permitting the springs to uncoil to the desired extent, a loosened condition of a. spring being shown indotted lines in Fig. 1. By increasing or decreasing the tension of springs 6 as thus described the force of the movement of latch-bar 1 is increased or decreased, so that by virtue of the connections of the latch-bar with. the type levers, hereinafter described, the force of the blow of the type bars on the tympanum roll is modified to the desired extent.

A detent 12 is suitably pivoted on a standard 13, which latter projects from the base 1, and the said detentis provided with an arm 14 normally in a position of slight inclination with reference to latch-bar 1. The arm 14 normally engages at its outer end in a notch 15 of the bar 1 and arranged near the outer end thereof, so as to hold the bar against the impelling force of the spring 6. A manually operable lever, such as the key lever 16, suitably fulcrumed in the standard 2, is arranged below bar 1 and detent 12 (in Fig. 2 a plurality are shown, one for each latch mechanism). A spiral spring 17 is connected at one end to an arm of the detent 12 and at its opposite or lower end to the key lever 16, the spring being adapted to serve a double purpose in maintaining the detent in engagement with the notch 15 of bar 1, and also restoring the key lever 16 to its normal position, after it has been depressed, on the withdrawal of the depressing force.

Suitably attached to the key lever 16, at a point immediately in advance of the heel 18 of the detent 12 is a bracket 19 on which is mounted a pawl 20 adapted to engage the said heel 18 of the detent. The pawl is maintained in its operative position by means of a spring 21 and is limited in its upward movement by means of a stop pin 22. As the key lever 16 is depressed, a face of the pawl 20 contacts with the heel 18 of the detent 12, forcing the latter back against the pressure of the spring 17 and withdrawing the arm l l of the detent from the notch 15 of bar 4:, thus releasing the bar and allowing the coiled spring 6 to impel the bar forward. As soon as the pawl 20 escapes from contact with the heel 18 of the detent, the spring 17 causes the detent to assume its normal position where it will be engaged by the notch 15 when the latch bar 4 has been restored to its normal position. When the key lever 16 rises to its normal position, after having been depressed, the pawl 20 engages the heel 18. and the spring 21 yields allowing the pawl to turn on its pivot and pass the heel, it being then in position to throw the detent when the keylever 16 is again depressed.

A collar 23 is mounted on the latch bar 4 so as to limit the travel thereof by abutting against standard 2 at the limit of forward movement of the latch bar. An adjustable collar is secured on the latch bar 1, and is adapted to engage with an arm 25 of a lever 26, which has connection, by means of a link 27, with the part to be operated, here shown. as a type bar 28, having the type face 29. The said lever 26, link, type bar and tympanum roll 30 represent diagrammatically the printing mecha nism of a typewriter and may be of any desired construction. As the latch-bar 1 is impelled forward, by the spring 6, the collar 24: engages the arm 25, and through the medium of the lever mechanism just described, imparts motion to the type bar 28, throwing it into printing position, as shown in dotted lines in Fig. 1.

Past the element A moves a member 35 which is engageable with the element A and in the present embodiment is shown as a cam ring. This member 35 is provided with stop means here shown in the form of a nose 37 which cotiperates with a shoulder 38 arranged on the element A, the stop means serving to arrest movement of the member 35 past the element A. In order to cause the member 35 to move the element a 7 there is provided an element which cooperates with the member 35 to reciprocate this member 35. This cooperating element is here shown as a disk 33 having a shoulder 23%, shown by dotted lines in Figs. A and 5 and in section in Fig. 6, a plurality of said disks and cams arranged side by side, as in practice, being shown in Figs. 2, 6 and 7. These disks are fixed upon a shaft 31 journalod in standards positioned forward of the element 4:. The shaft is adapted for rapid rotation, any desired means being employed for the purpose. The cams 35. preferably termed resetting cams, are held in position on the respective disks 33 frictionally by means of the spring tongues 36 each integral with the body of its cam and bearing on its respective disk. The arrangement is such that when the parts are in normal position the resetting cam is concentric to the shaft and rotates therewith in that position, the friction of the tongue 36 being only sufficient to hold the cam in such position when no resistance is offered to its rotation with the shaft 31. When the latter is thrown forward into the position shown in dotted lines in Fig. 1, the shoulder 38 is brought into the path of the nose 37 of the cam 35, during the rotation thereof. When the engagement of the shoulder and the nose 37 takes place, the rotary motion of the resetting cam is arrested, but the disk 31 continues its rotation, the result being that the cam 35 is projected outwardly from the shaft in a horizontal direction toward the right, Fig. 1. In Figs. 3 and 4 I have shown the cam at the moment of its'engagement with the shoulder 38 and after its rotative movement has been arrested and it has been projected outwardly from the shaft. The result is that the nose-37 of the cam moves in a radial line which passes from the axis or shaft through the point of arrested motion. As that point is the shoulder on the end of the latch-bar t, the line of motion of thenose 37 will therefore be parallel with the direction of movement of the l.atch-bar,.

and the resetting. cam will, therefore, in its outward movement, push the bar to the right, compressing the spring 6. As the nose 37 of'the cam reaches the limit of its outer movement, the detent 12 engages the notch 15 and the bar is held. Continued rotation of the disk 33 will now cause the cam to move in a direction toward the left, with the result that the nose 37 thereof will be withdrawn from its contact with the shoulder 38 of the latch bar (see Fig. and the frictional contact of the cam with the disk 33 causes it to rotate in unison therewith, in the position shown in Fig. 5, in which position it is at the time of its escape from contact with the latch bar. A stop 39 is provided for the purpose of restoring the resetting cam to its normal position, concentric with the shaft; the nose 37 contacts with the stop 39 and arrests the rotary movement of the cam, the continued motion of the disk drawing the cam inward toward the shaft, until at the moment that the cam reaches its normal position, concentric with the shaft, the nose 37 escapes from its contact with the stop 39, and the cam resumes its rotary motion. In practice each of the eccentric disks 33 is mounted on the shaft at a quarter of a turn farther around than the preceding one, the purpose of this arrangement being to cause the weight of the parts to balance as much as possible on all sides of the shaft, so that during the revolution of the latter, all tendency to vibration will be obviated. The arrangement just described is shown in Figs. 6 and 7.

In Fig. 8, I have shown a modified form of construction of the latch-bar 4, in which, in place of the coiled spring 6, I arrange aspring about a bar a1 which latter passes freely through the standard 3 and is connected to a bracket 42 mounted on bar 4. The spring 40 bears at one end against standard 3 and at its opposite end against bracket 42 and thus tends to impel the bar 4. forwardly.

In the modified form of construction shown in Fig. 9, in place of the pawl-20, shown in Fig. 1, I mount on the bracket or standard 19 which is connected with the key-lever 16, a ratchet wheel 43, having a pawl 44; and spring 45 controlling said pawl. In this construction, as the key-lever 16 is depressed, the face of a tooth on the ratchet wheel 43 contacts with the heel 18 of detent 12 forcing the latter back against the pressure of spring 17. As the key lever rises, after actuation, the shoulder of a tooth on the ratchet wheel engages the heel 18 of the detent, and the ratchetwheel turns and passes the heel, and is then in position to throw the detent when the key-lever is again depressed.

Having thus described my invention, what I claim is 1. In combination, a reciprocatorily mounted element, means for holding said element against reciprocation, said means being arranged to be released from the element, and means for reciprocating the element when the latter is disengaged from the holding means, the reciprocating means in cluding a rotary cam provided with a part arranged to engage the latch-bar and arrest the movement of the cam and an element arranged to move the cam radially when the rotary movement of the cam is arrested.

2. In combination, a reciprocatorily mounted latch bar, means to hold the latchbar against reciprocatory movement, means to disengzwe the holding means from the latch-bar, means tending to move the latchbar in one direction and means for moving the latch-bar in the other direction, the latter means including a cam provided with a portion arranged to engage the latch-bar and arrest the movement of the cam and an element arranged to move the cam radially to restore the latch-bar to its former position.

3. In combination, a reciprocatorilv mounted latch-bar, means to hold the latchbar against reciprocatorv movement, means to disengage the holding means from the latch-bar, means for moving the latch-bar in one direction when the holding means is released from the latch-bar, and means for moving the latch-barin the other direction, the latter means including a rotary cam provided with a portion arranged to engage the latch-bar and arrest the rotary move ment of the cam and an element arranged to move the cam reciprocatorilv to restore the latch-bar to its former position.

4. In combination, a reciprocatorilvmounted latclrbar, a detent to hold the latch-bar against reciprocatorv movement, a manuallv operable lever, means co-acting with the lever to disengage the detent from the latch-bar, means for moving the latchbar in one direction when the latch-bar is disengaged from the detent, an element ar ranged to be thrown by such movement of the latch-bar, operative connections between said element and the latch-bar, and means for moving the latch-bar in the other dircction, the latter means including a rotary cam provided with a portion arranged to engage the latch-bar and arrest the rotary movement of the cam, and an element ar ranged to move the cam radially to restore the latch-bar to its former position.

5. in combination, a shaft, a disk eccentrically mounted on said shaft, a cam mounted on said disk, means for the frictional engagement of said cam and said disk sufficient to permit the cam to rotate with the disk until the rotary movement of the cam is arrested and means for engaging said cam so as to overcome such frictional engagement and arrest the rotary movement of the cam, the arrangement being such that when the cam is so engaged it will be extended from its axis in a radial line passing through the point of engagement of said last named means with said cam.

6. In combination, a shaft, a disk eccentrically mounted on said shaft, a cam mounted 011 said disk, means for the frictional engagement of said cam and aid disk sufficient to permit the cam to rotate with the disk until the rotary movement of the cam is arrested, a member capable of reciprocating movement adapted to engage said cam and arrest the rotary movement thereof, means to move the member in one direction, the arrangement being such that when the cam is so engaged it will be extended from its axis in a radial line passing through the point of engagement of said member with said cam, and a stop adapted to engage said cam to arrestits rotary movement and re store it to its normal position.

7. In combination, a shaft, a disk eccentrically mounted on said shaft, said disk being provided with a flange or shoulder to provide spacing means between two juxtaposed disks, a cam mounted on said disk, a spring tongue integral with said cam and adapted to frictionally engage said cam with said disk whereby the cam and disk will rotate together until the rotary movement of the cam is arrested, said cam being provided with a nose on its periphery, a bar capable of reciprocating movement adapted to engage said nose and arrest the rotary movement of the cam, means to move said bar to engaging position, the arrangement being such that when the cam is so engaged it will be extended from its axis in a radial line passing through the point of engagement of said bar with said nose to cause the reciprocating movement of said bar, and a stop adapted to engage said cam to arrest its rotary movement and restore it to its normal position.

8. A double eccentric cam, consisting of a suitable shaft, a disk eccentrically mounted on the shaft, an outer cam ring mounted on said disk, means for the frictional engagement of said cam ring and said disk sufficient to permit the cam ring to rotate with the disk until the rotary movement of the cam ring is arrested, a nose on the outer periphery of the cam ring adapted when stopped to cause the disengagement of the cam ring and disk, the arrangement being such that when the disk continues to rotate and the rotary movement of the cam ring is arrested the latter will be extended from its axis in a radial line, passing through the said nose.

9. A double eccentric-cam, consisting of a suitable shaft, a disk eccentrically mounted on the shaft, an outer cam ring mounted on said disk, a spring tongue integral with said cam ring to frictionally engage said cam ring with said disk to an extent sufficient to permit the cam ring to rotate with the disk until the rotary movement of the cam ring is arrested, said cam ring being normally concentric with said shaft, a nose on the outer periphery of thecam ring adapted when stopped tocause thedisengagement of the cam ring and disk, the arrangement being such that when the disk continues to rotate and the rotary movement of the cam ring is arrested the latter will be extended from its axis in a radial line passing through the said nose.

10. In combination, a reciprocatorily mounted latch-bar, a detent to hold the latch-bar against reciprocatory movement, a key lever, means co'acting with the key lever to disengage the detent from the latch-bar, a spring impelling the latch-bar forward when thelatch-bar has been released, means for regulating the tension of the spring, means for moving the latch-bar in opposition to the spring, the latter means including a cam having a nose arranged to engage the latch-bar and an element arranged to move the cam radially when the nose is in engagement with the latch-bar, and a stop to engage said nose and return the cam to its normal position.

g 11. In combination, a reciprocatorily mounted latch-bar having a notch, a detent arranged to engage the notch and hold the latch-bar against reciprocatory movement, a manually-operable lever, means co-acting with said lever to disengage the detent from the latch-bar, a spring to impel the latchbar forward when the detent has been disengaged from the latch-bar, means for regi lating the tension of the spring, an element adapted to be thrown by the forward movement of the latch-bar, operative connections between said element and the latch-bar, a rotary'cam having a portion arranged to engage the latch-bar and arrest the rotary movement of the cam, and an element arranged to move the cam radially when the rotary movement of the cam is arrested.

12. In combination, a movable element,-a member mounted for movement into the path of and adapted to engage the element, stop means to arrest movement of the mem her when it is in engagement with the movable element, and a second element cooperating with the member to reciprocate the member and thereby move the first'element.

13. In combination, a latch bar capable of reciprocating movement, means urging the latch bar in one direction, a detent to hold the latch bar against movement bythe means, disengaging means for the detent, a member mounted for movement into the path of and adapted to engage the latch bar, stop means carried by the member and engageable with the latch bar, to arrest movement of the member past the latch bar when the member engages the bar, and an element cooperating with the member to reciprocate the member and thereby move the latch bar against the action of the first means.

In testimony whereoi. I have hereunto set JOSEPH LAZARUS, L. A. FUsTING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

